As brakes are life/death,i am going to suggest you ask someone to SHOW you how (buddy up)then when you are confident you can do all the families cars.
I COULD GIVE YOU STEP BY STEP INSTRUCTIONS BUT ITS NOT THE SAME.....you will need another person to help anyway...

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did you bleed all of the air from the master cylinder before you installed it, this has to be done. also when replacing the master cylinder, all 4 wheel cylinders will have to be bled, in order to get all of the air out of them. while doing the wheel cylinder bleeding , you will have to make sure that the master cylinder doe's not run out of brake fluid, check it each time you bleed a wheel cylinder , add brake fluid to the master cylinder each time or when it is getting low. hope that this has helped you.

I am always cautious when helping folks with brake issues. THEY ARE LIFE AND DEATH components. Please, If you have never done this proceedure before, and have a good knowledge of this area, consult a qualified technician; and YES, consider the brakes as a "Closed system", any breach of that system such as the removal of a hose, or line will require the purging of any air that is introduced, or brake failure is probable/likely.

If you don't have someone to help you you'll need to get a one man brake bleeding kit. The bleeding kit will take the place of the helper. IF you have a helper start with the rear passenger side wheel (furthest from master cylinder). Remove the wheel, have a helper sit in the vehicle and pump the brakes several times (motor off). Tell them to hold the pedal down while you open the bleeder screw. Tighten the bleeder screw before the helper releases the brake pedal to avoid sucking air back into the line. Repeat this process until the fluid flows out of the bleeder with no air. Then repeat these steps on each wheel. The order of bleeding is always furthest from the master cylinder. Rear passenger, rear driver, front passenger, and lastly front driver. After each wheel is done check the fluid level in the master cylinder and add as necessary. You don't want it to get low and **** air in from the cylinder.

You need to bleed the whole system. Once this is done it should work better. Make sure you are not low on brake fluid. If the front brakes are disk brakes and the rear are drum breaks, the front really does most of the stopping, the back jjust keeps the car from spinning or swaying. But the main stopping power is in the front breaks. They need to be bled correctly, make sure brake fluid is up and make sure emergency break is not engaged. The emergency break uses a lever and cable to activate the rear brakes. The emergency breaks don't run off brake fluid...

Bleed your brakes first, and make sure no air in lines, second check the poportional valve located after the master cylinder. follow the lines from the master cylinder to find it, last but not least abs system, run diagnostics and the code should lead you to your problem, if yu want the factory service manuals with troubleshooting guides, go to alldatadiy.com and purchase a subscription, 20.00 and you will have all manuals on your car.